Science is the exploration of questions.
When we find answers, the science stops unless we can find new questions in our
answers. If your students have found the amount of runoff from your school in a storm, they
can ask how much runoff would there have been in that same storm if the school
wasn't here? The streams and rivers developed to handle your area before
people moved in and changed the land. What additional runoff has your school or
community added to the drainage system? The lesson, "Rain Gardens", helps the
students evaluate this effect and explore ways to reverse the development's
runoff impact without halting development.

Hydro CAD Storm Modeling System
FREE Sampler is a professional model for developers and city planners.
Students who have time for extended investigations, Science Fairs, Junior
projects, etc, may find this model useful. The model is free. You can only use it
for 60 minutes before it closes down. You also can only save 5 nodes. A node is
a field or drainage pipe or pond. There are several samples available for
investigation. There is a fully functional version without these limitations, but
you need to buy it. The model is powerful which means that the student
will need to spend a fair amount of time learning the meanings of the variables
that must be set. Learning the system teaches a lot of science and
results in the production of a first rate product.